Coolant Temperature Sensor Failure Symptoms
- The vehicle may be difficult to start, may run lean when the engine is cold or slightly rich when the engine is hot (default to 'emergency program' mode).
- Driveability of the vehicle will be affected.
- If the sensor output signal fails open, shorted to ground, shorted to 12V or shorted to 5V the EMS2000 will replace the temperature value with a default value.
- If the sensor ground is shorted to 12V or shorted to 5V, temperature gauge will go to full hot and engine cooling fan goes to high when fault is recognized.